小麦抗冻蛋白对冷冻面团及馒头品质的改良作用

    Improving effects of wheat antifreeze protein on frozen dough and Chinese steamed bread qualities

    • 摘要: 为探究小麦抗冻蛋白(wheat antifreeze protein,WAFP)对不同冻融循环下冷冻面团及馒头品质的影响,将占小麦粉质量0.5%的WAFP添加至面团中,并以未添加WAFP的面团作为对照,进行2~10次冻融循环处理,测定面团的发酵力、流变特性、微观结构、水分分布以及馒头的比容、质构和挥发性风味物质等指标。结果表明:与对照组相比,添加WAFP的冷冻面团在多次冻融后发酵体积增长更明显,其中经10次冻融循环后,面团发酵体积较对照组提升59.65%;弹性模量(G')和黏性模量(G″)的下降幅度均减小;微观结构中的裂隙减少;经2、4、6、8、10次冻融循环后,结合水比例分别提升0.16%、0.18%、0.91%、1.13%和1.40%(P<0.05);添加WAFP制成的馒头硬度降低,黏性、内聚性等质构特性得到改善,且抑制了不良风味物质的生成。综上,小麦抗冻蛋白可有效抑制冰晶生长与重结晶,保护面筋网络的完整性,从而提升冷冻面团和馒头的冻融稳定性,改善冷冻面团的加工品质及馒头的蒸煮品质。该研究为WAFP在冷冻面团及馒头生产中的应用提供了理论依据。

       

      Abstract: To investigate the effects of wheat antifreeze protein (WAFP) on the qualities of frozen dough and Chinese steamed bread subjected to different freeze-thaw cycles, dough supplemented with 0.5% WAFP and control group without WAFP were subjected to 2-10 freeze-thaw cycles. Indicators including dough fermentability, rheological properties, microstructure, moisture distribution, as well as the specific volume, texture and volatile flavor compounds of Chinese steamed bread were assessed. The results demonstrated that compared with the control, dough with added WAFP showed better fermentation volume after repeated freeze-thaw treatments. After 10 freeze-thaw cycles, the fermentation volume was improved by 59.65% compared with the control group. The decreasing ranges of storage modulus (G') and loss modulus (G″) were reduced; cracks in microstructure decreased; after 2, 4, 6, 8 and 10 freeze-thaw cycles, bound water proportion increased by 0.16%, 0.18%, 0.91%, 1.13%, and 1.40%, respectively (P < 0.05). Chinese steamed bread made from WAFP-containing dough had lower hardness, improved textural properties including adhesiveness and cohesiveness, the formation of undesivable flavor compounds is inhibited.meanwhile the composition and content of volatile flavor substances tended to be stable. In conclusion, wheat antifreeze proteins effectively inhibit ice crystal growth and recrystallization, maintain the integrity of the gluten network, thereby improving the freeze-thaw stability of frozen dough and Chinese steamed bread, as well as the processing quality of frozen dough and cooking quality of Chinese steamed bread. This study provides a theoretical basis for the application of WAFPs in the production of frozen dough and Chinese steamed bread.

       

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